Home / 428,768.80-643,153.20-148,314.40

Finding the Fourth Proportional to 428,768.80, 643,153.20 and 148,314.40

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Solution

The fourth proportional to 428,768.80, 643,153.20 and 148,314.40 is: 222,471.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,768.80 : 643,153.20 = 148,314.40 : x
  2. Step 2: Convert to fraction form
    428,768.80/643,153.20 = 148,314.40/x
  3. Step 3: Cross multiply
    428,768.80x = 643,153.20 × 148,314.40
  4. Step 4: Simplify right side
    428,768.80x = 95,388,880,966.08
  5. Step 5: Solve for x
    x = 95,388,880,966.08/428,768.80
  6. Step 6: Final answer
    x = 222,471.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.